i bought a cheap amvona softbox and speedring off of ebay. now, i've bought an alien bees flash to use with it. but the speedring has the wrong center adapter (see pic below). amvona said that they don't make the insert for any mounts other than the one that it came with. now my question is: can i buy something like this link - http://www.adorama.com/PTMCAR01.html to use with the speedring i got from amvona? are the insert parts universal, or should i just order a whole new speedring from alienbees?